/*

  * Copyright 2005-2007 The Kuali Foundation

  * 

  * 

  * Licensed under the Educational Community License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  * 

  * http://www.opensource.org/licenses/ecl2.php

  * 

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.kuali.rice.kew.postprocessor;

 import java.rmi.RemoteException;

 import org.kuali.rice.kew.dto.ActionTakenEventDTO;

 import org.kuali.rice.kew.dto.AfterProcessEventDTO;

 import org.kuali.rice.kew.dto.BeforeProcessEventDTO;

 import org.kuali.rice.kew.dto.DeleteEventDTO;

 import org.kuali.rice.kew.dto.DocumentLockingEventDTO;

 import org.kuali.rice.kew.dto.DocumentRouteLevelChangeDTO;

 import org.kuali.rice.kew.dto.DocumentRouteStatusChangeDTO;

 import org.kuali.rice.kew.exception.ResourceUnavailableException;

 /**

  * A PostProcessor listens for events from the Workflow routing engine for it's DocumentType.

  * It gives clients hooks into the routing process to perform operations at the various stages.

  * Implementations of this Interface are potentially remotable, so this Interface uses 

  * value objects. 

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public interface PostProcessorRemote {

   /**

    * The document has changed route status. The docEvent contains the information about the change.

    * This method should do what ever is appropriate for various route status changes to a document.

    * The method should return true if the change is correct and all application actions as a result

    * of the change are successful. It should return false if the application considers this an

    * incorrect change.

    *

    * The method can throw a ResourceUnavailableException in order to requeue the

    * document and try again later.

    * @param statusChangeEvent

    * @param msg any error message to be propagated back to users should be set here

    * @return true if the status change is correct and application actions are successful

    * later if this exception is thrown

    * @see DocumentRouteStatusChange

    */

   public boolean doRouteStatusChange(DocumentRouteStatusChangeDTO statusChangeEvent) throws RemoteException;

   /**

    * The document has changed route level. The docEvent contains the information about the change.

    * This method should do what ever is appropriate for various route level changes to a document.

    * The method should return true if the change is correct and all application actions as a result

    * of the change are successful. It should return false if the application considers this an

    * incorrect change.

    *

    * The method can throw a ResourceUnavailableException in order to requeue the

    * document and try again later.

    * @param levelChangeEvent

    * @param msg any error message to be propagated back to users should be set here

    * @return true if the status change is correct and application actions are successful

    * @throws java.lang.Exception A general Exception will put the document into Exception routing

    * @throws ResourceUnavailableException requeue the document and try the change again

    * later if this exception is thrown

    * @see DocumentRouteLevelChangeDTO

    */

   public boolean doRouteLevelChange(DocumentRouteLevelChangeDTO levelChangeEvent) throws RemoteException;

   /**

    * KEW is signaling that the document should be deleted. The application can reject this by

    * returning false. If an Exception is thrown the docuemnt will go to exception routing. If

    * a ResourceUnavailableException is thrown, the doc will be requeued and will try again later to

    * delete the document.

    * @param event

    * @param message

    * @return

    * @throws java.lang.Exception A general Exception will put the document into Exception routing

    * @throws ResourceUnavailableException requeue the document and try the change again

    */

   public boolean doDeleteRouteHeader(DeleteEventDTO event) throws RemoteException;

   /**

    * KEW is signaling that the document has had an action taken on it by a user

    * 

    * @param event

    * @return

    * @throws RemoteException

    */

   public boolean doActionTaken(ActionTakenEventDTO event) throws RemoteException;

   /**

    * The document is about to be processed by the Workflow engine.

    * 

    * @param event - holder for data from the engine's process

    * @return true if the method is successful, false otherwise

    * @throws java.lang.Exception A general Exception will put the document into Exception routing

    */

   public boolean beforeProcess(BeforeProcessEventDTO event) throws Exception;

   /**

    * The document has just completed processing by the Workflow engine.

    * 

    * @param event - holder for data from the engine's process including whether the engine was successful or not

    * @return true if the method is successful, false otherwise

    * @throws java.lang.Exception A general Exception will put the document into Exception routing

    */

   public boolean afterProcess(AfterProcessEventDTO event) throws Exception;

   /**

    * Executed prior to document locking in the workflow engine.  This method returns an array of document

    * ids to lock prior to execution of the document in the workflow engine.  If the engine processing is

    * going to result in updates to any other documents, they should be locked at the beginning of the engine

    * processing transaction.  This method facilitates that.

    * 

    * <p>Note that, by default, the id of the document that is being processed by the engine is always

    * locked.  So there is no need to return that document id in the array of document ids to lock.

    * 

    * @return an array of document ids to lock prior to execution of the workflow engine

    */

   public String[] getDocumentIdsToLock(DocumentLockingEventDTO event) throws Exception;

 }